SP6681

The SP6681 is a charge pump ideal for converting a +3.6V Li-Ion battery input to a +5.0Vregulated output.  An input voltage range of +2.7V to +5.5V is converted to a regulated outputof  5.0V.  The SP6681 device will operate at three different switching frequencies correspond-ing to three different output resistances and load current ranges.  An external 32.768kHznominal clock signal is used to produce three synchronized pump frequencies through the usean internal phase lock loop to drive the charge pump.  Two control inputs can adjust the internalpump frequency on the fly to 8.192kHz (f_INPUT / 4), 32.768kHz (f_INPUT x 1), or 262.14kHz (f_INPUT x 8).  The charge pump configuration dynamically changes to optimize power efficiency.  Atlow input voltages the charge pump doubles the input while at higher inputs the output is 1.5times the input.  The SP6681 can deliver high power efficiencies up to 96% with low quiescentcurrents from 175A to 800A.  The SP6681 is offered in a 10-Pin SOIC package.